To save' is a gerund and it is functioning as the subject of the sentence.
<h3>What is a gerund?</h3>
A gerund can be regarded as a verb form which functions as a noun.
A gerund do appear in sentence as form of blend of verbs and nouns, which now perform the function of a noun in that sentence.
Therefore, To save ,in this sentence stand for the subject, which is functioning as a noun in the statement .
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Answer:
He acts like he's going to cry. C.
Embryology, or the study of embryos, can help us find plenty of evidence to support the theory of evolution. For example, vestigial structures such as tails or gills in humans can be found in embryos early during their development.